| System | Score Software | WS97 DevTest Version | Abs WER Reduction |
| Tree-based pron models, no acoustic retraining | HResults | Jul 1 0.3 pruned | -0.9% |
| Tree-based pron models, acoustic retraining | HResults | Jul 1 0.3 pruned | +0.9% |
| Multi-word and single-word pronunciation extended dict | HResults | Jul 18 | -0.9% |
| Multi-word and single word extended dict, word boundary phones and hesitation-specific phones | HResults | Jul 18 | -2.0% |